Heat-exchange system



' w. GOAT ES. .HEAT EXCHANGE SYSTEM; APPLICATION FlLE D'AP fi. 29. 1921. J

= v Patented Dec. 27, 1921.

2 SHEETS-SHEET 1.

ATTORNEYS w.-' COATES. HEAT EXCHANGE SYSTEM.

APPLICATION riuan APR. 23. 1921.

gamma Dee; 27,1921.

QVEN'TOR ATTORNEYS- WILLIAM comes, or NEWARK, NEW? JERSEY.

near-EXCHANG SYSTEM.

I T till whom it may concern:

Be it known that I, WILLIAM CoA'rns, a citizen of the Uuited States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Heat-Exchange Systems, of which/the following is a speci- This invention relates to a heat exchange system for utilising the hot, water and steam .of a steam 'or hot water heating system for Q heating the /water of a hot water, service system, suc'lf for instance as the hot water a tank in thekitchen of a dwelling.

I l i [vide a s stem of the character described whereby 0t servicewater can be obtained at all times even during the ni ht and early The objects of the inventionl'are to ro morningwhen the boiler fires are banked and the steam is low or the water is below ordinary operating temperature; to provide improved means for utilizing the return fluid from a heating system for heating service 7 water; to thus provide astand pipe or chamher connected at one end to the water chamber of the boiler of a heating system adjacent the bottom thereof and connected at an in 'termediate point in its length to said water chamber immediately below the water level heat ng system whereby the water in said boiler circulates through said-stand-pip'e and @the return fluid' also passes thereinto, a conduit connected to the service water tank having a portion thereof, arranged within said stand-pipe; to provide such a system in which the circulation iof the boiler water in the stand-pipe produces a partial vacuum in the return pipe to facilitate the circulation of steam throughthe heating system to provide 1 an improved construction for allowing free expansion and contraction of the portion of the service water pipe line within said stand-pipe due to changes in'the temp'erature of the water, and to obtain other results and advantages as may be'brought out by the following description. Referring to the accompanying drawings, in which like numerals of reference indicate the same parts throughout the several views,

Figure 1 is a side elevation of a heat exa change system comtructed in accordance with my invention, portions of tank being broken away;

Fig. 21s an enlarged transverse vertical the hot water Specification of Letters Patent.

Patented Dec. 27, 1921.

Applicatlon flled Apri129,1921. Serial No. 465,383;

' sectional view through the connection of the upper end of the stand-pipe to the steam return pipe and showing the slip joint of the serv ce water pipe with the stand-pipe;

Fig. 3 is a similar View ofthe connection showing a modified construction;

' Fig. 4 1s a vertical sectional view through the connection of the stan -pipe to the upper end of the water chamber .of the steam boiler;

Fig. 5 is a similar view of the connection of the stand-pipe to the lower end of the water chamber and: the connection of the service/water pipe to the'stand-pipe, and

reference character A designates a stand pipe which ispreferably formed of two sections l and-2 which are adapted to be arranged in a vertical position at-one side of the loiler B of a heating system. One end of one of the sections of the stand-pipe, in

the present instance the section 1, is connected by a T-connection 3 and a branch pipe '4 to the water chamber of the boiler B adjacent the lower'end thereof, the upper end of said section of the stand-pipe, being connected by a similar T 5 and branch pipe 6 to theup'per end of the water chamber immediately below the level of the water therein. One end of. the section 20f the stand-pipe is connected-lo the Tz-filsopposite the section 1 and the opposite end of said section 2 is connected to a T 7 the lateral arm of which'is connected to the return pipe 8 of the heating system which includes the boiler B and the live steam pipe9.

A pipe 10 of relatively high conductivity, such as a brass pi e, and having a diameter substantially less t an that of the stand-pipe A, is arranged axially of the stand-pipe,

the lower end of said pipe 10 projecting outwardly belowthe T 3 and being connected thereto by a reducing plug 11 which has a threaded connection with both the pipe.

10 and the T, as clearly shownin Fig. 4 of Fig 6 is a side elevation of a modified constand-pipe A and will transfer its heat to Another form of slip joint for the pipe" 10in the stand-pipe and connection of thestand-pipe to the return steam pipe 8 is shown in Fig, 3, this construction being preferable in many cases. A three way -connection' 21 having alined branches of a size to fit the stand-pipe Aone of which is connected to the stand-pipe, is utilized instead of thespecial-T l'. The slip' joint is formed by. a bush1ng22 screwed into the branch of the T opposite the stand-pipe,- which bushing has a reducing bushing 23' screwed therein forming between itselta'nd said bushing 22 a gland 24'through which asses-the upper end of the pipe .10. 1 The ower end of the pipe 10 is connected in any suitable'manner to one end of a pipe 15, theother end of which is connected to the bottom of the hot water tank 16. 'The upper end of the pipe 10 is connected to one end of a pipe 17, the other end of which is connected to the hot water tank 16 at anintermediate point in its length, as shown in Fig. 6. The service water is supplied to the tank 16 in the usual way, and it will be observed that the said water. will flo through the pipes 15, 10 and 17. I

In the operation of the system shown in Fig. 1 of the drawings, the hot water in the upper end of the water chamber of the boiler B will circulate through the branch pipe 6 and T 5 into the lower section 1 of the the comparatively cool water in the pipe 10 which flows from the tank 16. As the water utilize theheat of the return fluid for heating the service water in the tank 16 and at the same time prevent said return fluid from passing into the live steam pipes, or vice versa. As return fluid strikes the comparatively cool pipe 10 it will be immediately condensed and flow downwardly through the'section 2 of .the stand-pipe, the said condensation producing a partial vacuum in the return pipe 8 to facilitate the. circulation of steam through the heating system. To further increase the production of partial vacuum in the steam heating system I may provide an inverted frusto-conical tube 18 at'the upper end of the sectionl of the stand-pipe, as shown in Fig. 4 of the drawings, the circulation of water downwardly through the venturi producing apartial vacuum in the section 2 of the stand-pipe. The hot water entering the stand-pipe through branch pipe 6 is quickly cooled by contact with the pipe 10 and rapidly falls downwardly through the tube 18 which further increases the velocity of said water.

A modified connection of my system to a steam heating system is shown in Fig. 6 of the drawings in which the lateral arm of the-T 7 is dlrectly connected by a branch 20 to the live steam pipe 9 instead of to the return pipe. upperend of the pipe 10 within the section 2 of the stand-pipe will be heated by livesteam instead of by the return steam, and the operation of the system is otherwise identical with that described in connection with Figs. 1-4 inclusive. In both'forms of the invention the construction of the standpipe and the arrangement of the pipe 10 therein is identical,

drawing of hot water from the tank 16 and With this construction the 86 The slip joints .12 or 24 are necessary to the sudden flow of cool water into the pipe I 10, or the gradual expansion of the pipe, 10 "due to the heating thereof after contraction by the flow of cool water thereinto. It will be noted that the pipe 10 is in one piece and forms a continuous and unbroken conduit through the stand-pipe A, thereby eliminating any connections within the stand-pipe through which the water in pipe 10 might leak into the stand-pipe, or vice versa, as would .be the case were the pipe 10 formed sections connected within thestand-pipe.

in the return steam and hot water which is usually wasted or lost, this heat being utilized to heat service water in the tank 16 which in turn assists in heating the room in which the tank-16 is located.

While I have shown and described two possible embodiments of my invention, it will be understood that this 'is for the purpose of illustrating the principles thereof only, and that many modifications and changes can'be made in the detail construction of my invention without departing from the spirit or scope thereof. Therefore, I do not desire to be understood as limiting myself except as required by the following claims when construed in the light of the prior art.

Having thus described I claim is:

1. The combination with a water tank and a steam heating system including a boiler and a steam pipe, of a stand-pipe arranged exteriorly of said boiler and connected to the water chamber of said boiler at points adjacent the bottom thereof and immediately below the water level therein, said stand-pipe .being also connected to said system enables the recovery of the heat' the invention, what steam pipe above the said water level, and a conduit connected to said water tank and having a portion thereof passing through said stand-pipe.

2. The combination with a water tank' and a heating system having a boiler and a return pipe, of a stand-pipe arranged vertically atone side of said boiler and forned in twosections connected in alinement by a T-connection, the lower end of the lower one of said sectionsbeing connected to the water chamber of said boiler adjacent its bottom and one arm of said T-c0nnection being connected to said water chamber immediately, I

below the waterlevel therein, the upper end of'the upper section of said stand-plpe being in communication with the return pipe, whereby the water in said chamber and the fluid from said return pipe circulate through said stand-pipe, and, a conduit connected with said water tank having a portion thereof passing through said stand-pipe from end to end thereof. v

, 3. The combination with a water tank containing water tobe heated and a steam heating system having a boiler and a return ipe,

' ofa stand-pipe connected to the water c amber of said boiler at points adjacent the. bottom thereof and immediately below the water line thereof, said stand-pipe being also connected above the water level therein to said return pipe, a conduit connected with said water tank passing through said stand 5 pipe and contacting with the water in said stand-pipe and the fluid in the return pipe, and an inverted frusto conical tube arranged in said stand-pipe immediately below the water lever therein so that circulation of water downwardly in said'stand-pipe causes a partial vacuum in the stand-pipe above the water level to increase circulation of steam in the steam heating system.

4. The combination with a steam heating v system having a boiler and a return pipe, of a stand-pipe connected to the water chamber of said boiler at points adjacent the bottom system.

WILLIAM COATES. 

